Hello electro-musicians. I tried to install hawk 800 mod, and have an issues. When I installed hawk 800, it wont power on. I put original IC29 and IC22. And it works but with some missed features (no midi, no waveforms selection, noise on low octaves DCO). Michael Hawkins said it can be a problem in IC29 connection. Actually I did not touch anything but IC22 and IC29. I checked it visually and with multimeter, but no luck. Now I want to try it with schematic.
I am trying to check all connections, but have a problem reading block diagram, as only I have (can not find PCB layout).
Is this dot (in red) connection between 7-15 IC29 ouputs? If yes, I just can`t find it on board. What is YO-7 and AO-7?

Sorry for being very newbie, but I am trying to make it works near 2 weeks.

Thanks. It totally make sense. How to understand which wire on the bus connects what? As I understand something connects with the thing that I marked, but what pin connects with it?
UPD.:Oh, or it doesnt connect as it different buses

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